3. The genetic code is commaless, which means that no codon is reserved for punctuations. It means that after one amino acid is coded, the second amino acid will be automatically, coded by the next three letters and that no letters are wasted as the punctuation marks (Fig.
Summer solstice is the first day of summer - it's usually between June 20th and June 23rd. In 2016, the summer solstice takes place on June 20th. We know it's summer because the earth's axis tilts toward the sun from June to September - this means warmer weather and longer days.
This summer solstice is the day with the most hours of sunlight during the whole year. See our handy sunrise and sunset calculator for how many hours of sunlight you get in your location. At the winter solstice, just the opposite occurs: The Sun is at its southernmost point and is low in the sky.